Writing instrument



FIG. 1 is a side elevational view of a writing instrument showing my newdesign with the point retracted, the opposite side being a mirror imagethereof;

FIG. 2 is a left end view thereof;

FIG. 3 is a right end view thereof; and

FIG. 4 is a top plan view thereof with the point extended.

The ornamental design for a writing instrument, as shown and described.